Tricyclic compounds of formula (I) ##STR1## wherein X.sup.1 is a carboxyl or 5-tetrazolyl group X.sup.2 is carbonyl or methylene X.sup.3 is hydroxyl or a group --X.sup.4 (C.sub.n H.sub.2n)X.sup.5 where X.sup.4 is oxygen or sulphur X.sup.5 is hydrogen or a group --OX.sup.6 where X.sup.6 is hydrogen, alkanoyl of 1 to 4 carbon atoms or a group --(C.sub.m H.sub.2m)X.sup.7 where X.sup.7 is hydrogen or a group --OX.sup.8 where X.sup.8 is hydrogen or alkanoyl of 1 to 4 carbon atoms and m and n are each, independently, an integer from 1 to 4, together with salts thereof, provided that when X.sup.5 is a group --OX.sup.6 then n is always greater than 1 and X.sup.4 and X.sup.5 are attached to different carbon atoms and that when X.sup.7 is a group --OX.sup.8 then m is always greater than 1 and no single carbon atom in the radical --(C.sub.m H.sub.2m)-- is attached to two oxygen atoms. These compounds are of value in medicine in circumstances where it is desirable to provide a more effective delivery of oxygen to the tissues; in vivo applications include the relief or amelioration of tissue hypoxia as in, for example, cardiac or cerebral ischaemia while in vitro they maintain the oxygen-delivery capacity of stored red blood cells and prolong the cells' useful storage life. The invention is also directed to methods for the preparation of the compounds, to pharmaceutical formulations and other presentation forms containing them and the preparation thereof, to the use of the compound in medicine, and to novel intermediates for the said compounds and the preparation thereof.
公式(I)的
三环化合物 ##STR1## 其中X.sup.1是羧基或5-
四唑基团,X.sup.2是羰基或亚甲基,X.sup.3是羟基或一组--X.sup.4(C.sub.n H.sub.2n)X.sup.5,其中X.sup.4是氧或
硫,X.sup.5是氢或一组--OX.sup.6,其中X.sup.6是氢,1到4个碳原子的脂肪酰基或一组--(C.sub.m H.sub.2m)X.sup.7,其中X.sup.7是氢或一组--OX.sup.8,其中X.sup.8是氢或1到4个碳原子的脂肪酰基,m和n各自独立地是1到4的整数,除非X.sup.5是一组--OX.sup.6,否则n始终大于1,并且X.sup.4和X.sup.5附着在不同的碳原子上,当X.sup.7是一组--OX.sup.8时,m始终大于1,并且--(C.sub.m H.sub.2m)--中的任何一个碳原子都不附着在两个氧原子上。这些化合物在医学上具有价值,在需要提供更有效的氧输送到组织的情况下,体内应用包括缓解或改善组织缺氧,例如心脏或脑缺血,而体外应用则保持储存的红细胞的输氧能力并延长细胞的有用储存寿命。本发明还涉及制备化合物的方法、含有它们的制药配方和其他制剂形式以及其制备、化合物在医学上的应用以及所述化合物的新中间体及其制备。